ORA-00205: error in identifying control file, check alert log for more info

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You should be able to look at the init/spfile and find out where the control files should be. Are they there? Did they get corrupted? Did someone chmod them so that the database could not read/write to them? Are you using the wrong init/spfile? You can also look through the alert log and see which control files were used that last time the database started successfully.

Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

ORA-00205: error in identifying control file

I hope your whole database is not on /disk1. If so there is only 35MB there now. "/dev/hdd7 2.0G 36M 1.9G 2% /disk1"

So how am I going to search through you server and find the missing control file? Is there anything in /disk1/sun/controlfile? Did someone delete the control file? Did someone delete the database? Did this database ever start before? Where is your backup?

All that you told me is that you have Oracle binaries. How did you create the database? Did you use the dbca tool? How long have you been using this database? How much data should be in the database? When did the database suddenly stop? Did the database ever exist?